Are you operating in the correct SPL window for high-fidelity listening?

Some recordings are "cut" hotter than others. There is also the ambient noise of the listening room to take account of, leaving to one side the noise threshold of the system itself. Using high sensitivity speakers (104db), I had to work like the devil to quiet the system from inter-component grounding anomalies and to ensure that the power feeding my system was quiet without using "conditioners." All that said, I can hear the program material at low volume, but to energize the fairly large room my main system is in, I do need to give the system some gain.

I've mentioned this before, but every recording seems to have a "natural" volume at which it sounds best. I manage to avoid having the system "play at me" or sound like a reproduction system; instead, I'm able to get a pretty organic sound that appears from a silent background. Granted, there is considerable variability in different records; but I don't let sonics dictate my preference of listening material. Most of what I'm listening to is small combo jazz on records manufactured in the early-mid '70s, which was a nadir of vinyl production in the U.S. 

It depends on the recording and my mood, but I typically listen in the 70-85dB range.  

When I was younger, and when my system didn’t sound like it does now, I played it much louder to get some sort of a sensation from it.   It had less resolution, more noise, less dynamic contrast , was less coherent, and had a less defined sound stage.  The current system no longer requires that volume level to float my boat, so I typically listen at lower levels.  Once in a while if we have a dedicated listening night, the volume goes up a bit, but I’d be surprised if we ever went over 90dB.

The gap between 70 and 85 db SPL is huge, which speaks to my point that we have no agreed upon standard for measurement in the first place.  So discussing in terms of SPL is meaningless.

Small room here I typically listen in the 55-70db range using sensitive speakers and low powered tube amps it's plenty loud for me.